Diagramming•ERDData
Entity Relationship Diagrams (ERD)
Design database schemas visually: tables, columns, primary keys, foreign keys, and relationships. Export SQL and a PDF data dictionary for documentation.
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Table‑style entities
Entities render as professional table cards with fields and PK/FK markers.
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Crow’s Foot toggle
Switch notation between Crow’s Foot and Chen as you model.
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SQL + PDF exports
Export PostgreSQL DDL and a PDF data dictionary for handoffs.
Best for
- ✓Database schema design
- ✓FK relationship mapping
- ✓Architecture & data platform docs
- ✓Sharing with engineers and DBAs
Pro tips
- ✓Define PK fields first, then mark FK fields and reference PKs.
- ✓Use Auto‑Layout to quickly space out tables, then fine‑tune manually.
- ✓Export PDF for stakeholders; export SQL for implementation.
- ✓Use Import SQL to reverse‑engineer from DDL (best-effort).
About this tool
Create ERD diagrams with entities, fields, PK/FK constraints, and relationships. Export SQL and documentation.
What it does
- Design database schemas visually with entities and relationships.
- Export PostgreSQL DDL and share diagrams for review.
How to use
- Click Create ERD.
- Add entities and fields (PK/FK).
- Export SQL or SVG when ready.
FAQ
Can I export SQL?
Yes. Export generates PostgreSQL DDL (best-effort).
Can I import SQL?
If supported on the editor, import can parse basic CREATE TABLE statements (best-effort).
Does it support PK/FK?
Yes. You can mark fields as PK/FK and link relationships.